Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d02dba54c022e0…

MALICIOUS

PDF

90.6 KB Created: 2021-09-05 17:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94eda7ab268453f3742a81d7632addde SHA-1: 981c10877626424fcc39a96cd7d8f414f97c4fdc SHA-256: a0d02dba54c022e05fa2e8bbfd69f147431fc692cfe9d5cb8370c56dfded73af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/wevogukiwo.pdf In PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/po4nd7giqddj6u25bcj1mjnoqc/62030002397.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/74683914156.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/seekiin8n60o5oek0653mltkko/xusisojama.pdfIn PDF document text
    • http://4darchitecture.org/img/all/degenoxafiwomigadus.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1gr2om8vndfilvvo93u7ogq9l4/34640607565.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c84587ac---31075243423.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607427b7e2873---jedikaz.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/07922d2f31e3c63af2183dbd7da3b2d7/xuxuloxupulidikazavoje.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/woresesudonigelimafa.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/ferakisaw.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/vupetuge.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a8722d4da89280e80c9a5fb3ea4666a5/wugenizisezibonumemonit.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608df2b11ed9a---11137734088.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd824d747b---wixoparekipozop.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714614898c8---wumon.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaabfe3b2b---24820310189.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/sadevukabonavop.pdfIn PDF document text
    • https://aneri12.eu/res/file/77441354472.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/watafirozimotatibe.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16078fa5a682b4---lezitipoxikadowedekejaf.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/2995882753.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/55583564660.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/25306994786.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5j2ub7qa0etsc7rkj508soj031/jobinawexez.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3caae4acf---nalaruresu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=leonidas+lamborghini+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 10944 bytes
SHA-256: 333f11a7b354e722e75d6ba0ce751be8cec0c03410ad07fc80dc58cd62f42d90
font_01_sfnt_off00010e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 20976 bytes
SHA-256: b57f2a9fa492e088abe08ebadcaede95021711c5c8d9ef2463f1a372c3071096
font_02_sfnt_off000144c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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